'''
 python3中支持int float bool complex(复数)
 id()返回对象的唯一地址(标识符)
 type()可以查询变量所值对象的数据类型
'''
a = 1
print(id(a))
a = 1
print(type(a))
print(id(a))
a = 3.14
print(type(a))
# del 用于删除变量 del a ,b,c
del a

b = True
print(type(b))

c = 4+3j
print(type(c))

# m = 10 n =20 交换这两个值，用几行代码
m = 10
n = 20
m,n = n,m

temp = m
n = m
m = temp

m = m^n
n = m^n
m = m^n

m = m - n
n = m + n
m = n - m

m = m + n
n = m - n
m = m - n